<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script src="vue.js"></script>
	</head>
	<body>
		<div id="app">
			<div>
				a的值{{a}}
			</div>
			<div>
				<button type="button" @click="add">点我加1</button>
			</div>
		</div>
		<script>
			var app=new Vue({
				el:"#app",
				data:{
					a:1
				},
				methods:{
					add(){
						this.a++;
					}
				},
				computed:{
					
				},
				watch:{
					a:function(newVal,oldVal){
						console.log("新值:",newVal,"上一次的值:",oldVal);
					}
				}
			});
			console.log("app.$data:",app.$data);
			console.log("app.$el:",app.$el);
			//console.log("a:",app.a);
//			app.$watch("a",function(newVal,oldVal){
//				console.log("新值:",newVal,"上一次的值:",oldVal);
//			})
		</script>
	</body>
</html>
